distance (redirected from guard distance)

distance /dis·tance/ (dis´tins) the measure of space intervening between two objects or two points of reference.

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focal distance  that from the focal point to the optical center of a lens or the surface of a concave mirror.

interarch distance  the vertical distance between the maxillary and mandibular arches under certain specified conditions of vertical dimension.

interocclusal distance  the distance between the occluding surfaces of the maxillary and mandibular teeth with the mandible in physiologic rest position.

interocular distance  the distance between the eyes, usually used in reference to the interpupillary distance.

working distance  the distance between the front lens of a microscope and the object when the instrument is correctly focused.

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dis·tance (dstns)

n.

The extent of space between two objects or places; an intervening space.

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distance,

n the measure of space intervening between two objects or two points of reference.

distance, cone,

n the distance between the focal spot and the outer end of the cone; usually expressed in inches or centimeters. Modern dental roentgen-ray units usually have cone distances of from 5 to 20 inches (12.5 to 50 cm).

distance, interarch (interridge distance),

n the vertical distance between the maxillary and mandibular arches under conditions of vertical relations that must be specified.

distance, interocclusal (interocclusal gap, free-way space),

n the distance between the occluding surfaces of the maxillary and mandibular teeth when the mandible is in its physiologic rest position. This can be determined by calculating the difference between the rest vertical dimension and the occlusal vertical dimension of the face.

distance, interridge,

n See distance, interarch.

distance, large interarch,

n a large distance between the maxillary and mandibular arches.

distance, long (extended) cone,

n the distance is usually 14 to 20 inches (35 to 50 cm). See also cone, long.

distance, object-film,

n the distance, usually expressed in centimeters or inches, between the object being radiographed and the cassette or film.

distance, operator,

n See positions at the chair.

distance, short cone,

n a focal-skin distance of 9 inches (22.5 cm) or less; usually refers to the distance as determined by the cone supplied by the manufacturer of the basic radiograph unit.

distance, small interarch,

n a small distance between the maxillary and mandibular arches.

distance, target-film (anode-film distance, focal-film distance),

n the distance between the focal spot of the tube and the film; usually expressed in inches or centimeters.

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distance

the measure of space intervening between two objects or two points of reference.

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critical distance

see flight distance.

focal-film distance

the distance between the anode of the x-ray tube and the film; an important exposure value.

flight distance

see flight distance.

guard distance

see flight distance.

interocclusal distance

the distance between the occluding surfaces of the maxillary and mandibular teeth with the mandible in physiological rest position.

interocular distance

the distance between the eyes, usually used in reference to the interpupillary distance (the distance between the two pupils when the visual axes are parallel).